Hi All,
I am writing this blog to describe output logs from Flask based applications on SAP cloud foundry.
Logging is very important for efficient development. With sap_cf_logging library, it is easier to output and see logs.
Please see my GitHub repository "YoheiFukuhara/cloudfoundry-python-logging" for further detail.
If you don't know how to deploy application to Cloud Foundry, see another article "Create simple Flask REST API using Cloud Foundry".
Since sap_cf_logging libraries supports python 2.7 and 3.5, I used python 3.5(not 3.6).
I only used Flask and sap_cf_logging.
The application code is like this.
There is nothing special about deployment. Just push the application.
See logs using cf CLI.
When you want to see log history, use option "--recent".
This is the log, after accessing the application via browser.
You can see http request information as JSON format in the red frame. There are many helpful information as timestamp, line no and so on.
Python "print" command can also leave log. But it only leaves "<Request 'http://sample-logging-proud-impala.cfapps.eu10.hana.ondemand.com/' [GET]>" here, since "request" is object type variable.
WIth sap_cf_logging library you will get much benefit while development. Have fun!
I am writing this blog to describe output logs from Flask based applications on SAP cloud foundry.
Logging is very important for efficient development. With sap_cf_logging library, it is easier to output and see logs.
Please see my GitHub repository "YoheiFukuhara/cloudfoundry-python-logging" for further detail.
If you don't know how to deploy application to Cloud Foundry, see another article "Create simple Flask REST API using Cloud Foundry".
Application
Python runtime(runtime.txt)
Since sap_cf_logging libraries supports python 2.7 and 3.5, I used python 3.5(not 3.6).
python-3.5.5Used libraries(requirements.txt)
I only used Flask and sap_cf_logging.
Flask
sap_cf_loggingFlask application(sample-logging.py)
The application code is like this.
from flask import Flask, request
from sap.cf_logging import flask_logging
import os, logging
app = Flask(__name__)
#Iitialize logging
flask_logging.init(app, logging.INFO)
cf_port = os.getenv('PORT')
# Only get method by default
@app.route('/')
def hello():
logger = logging.getLogger('my.logger')
logger.info(request)
print(request)
return 'Hello World'
if __name__ == '__main__':
if cf_port is None:
app.run(host='0.0.0.0', port=5000, debug=True)
else:
app.run(host='0.0.0.0', port=int(cf_port), debug=True)
Deploy and Monitor Log
Deployment
There is nothing special about deployment. Just push the application.
cf push <application name>Monitor logs
See logs using cf CLI.
cf logs <application name>When you want to see log history, use option "--recent".
cf logs <application name> --recentThis is the log, after accessing the application via browser.
You can see http request information as JSON format in the red frame. There are many helpful information as timestamp, line no and so on.
{
"msg": "<Request 'http://sample-logging-proud-impala.cfapps.eu10.hana.ondemand.com/' [GET]>",
"line_no": 16,
"layer": "python",
"written_ts": 1544603923048154000,
"correlation_id": "74f6ee3d-433d-4797-467d-cae1f053812b",
"component_name": "sample-logging",
"space_name": "dev",
"logger": "my.logger",
"container_id": "10.0.137.233",
"thread": "Thread-12",
"written_at": "2018-12-12T08:38:43.048Z",
"level": "INFO",
"component_instance": "0",
"type": "log",
"space_id": "2741076c-c551-4b62-8ebc-c1328bbc08d7",
"component_id": "1df97d1e-6386-48b7-9035-3bab082edffc",
"component_type": "application"
}Python "print" command can also leave log. But it only leaves "<Request 'http://sample-logging-proud-impala.cfapps.eu10.hana.ondemand.com/' [GET]>" here, since "request" is object type variable.
Lastly
WIth sap_cf_logging library you will get much benefit while development. Have fun!
Bluesky
